CN112038152B - Backlight and state indicating circuit of rocker switch of commercial vehicle - Google Patents
Backlight and state indicating circuit of rocker switch of commercial vehicle Download PDFInfo
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- CN112038152B CN112038152B CN202010929374.7A CN202010929374A CN112038152B CN 112038152 B CN112038152 B CN 112038152B CN 202010929374 A CN202010929374 A CN 202010929374A CN 112038152 B CN112038152 B CN 112038152B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H23/00—Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
- H01H23/02—Details
- H01H23/025—Light-emitting indicators
Abstract
The invention discloses a backlight and state indicating circuit of a rocker switch of a commercial vehicle, which comprises: a protection circuit; the first current limiting circuit and the second current limiting circuit are respectively connected with the protection circuit at one end, and are connected in parallel; one end of the first backlight circuit is connected with the first current limiting circuit, and one end of the second backlight circuit is connected with the second current limiting circuit; the LED display device comprises a first indicator light circuit and a second indicator light circuit, wherein one end of the first indicator light circuit is connected with a first current limiting circuit and a first backlight circuit respectively, the other end of the first indicator light circuit is connected with a first contact of a rocker switch, one end of the second indicator light circuit is connected with a second current limiting circuit and a second backlight circuit respectively, and the other end of the second indicator light circuit is connected with a second contact of the rocker switch. The invention is compatible with the indication of the positive control switch and the indication of the negative control switch under the condition of not changing the circuit structure, and has an interlocking function between the indication lamp and the backlight lamp.
Description
Technical Field
The invention relates to the technical field of control circuits of rocker switches of automobiles, in particular to a backlight and state indicating circuit of a rocker switch of a commercial automobile.
Background
The traditional rocker switch is connected between the positive electrode of the storage battery and the load, and can supply power to the load after being connected, and the signal comes from the positive electrode of the storage battery, namely the positive control. In contrast, the signal from the negative electrode of the battery is called "negative control". Compared with the positive control signal, the negative control signal does not need a storage battery power line from the battery, and has higher safety and economy than the positive control signal.
Along with the popularization of electronic equipment on a passenger car, the role of power supply of the rocker switch is gradually replaced by the electronic equipment, the rocker switch is changed from power supply to signal supply, and the connection mode is changed from positive control to safer and more economical negative control connection mode. However, when the existing rocker switch backlight circuit and the indicating circuit work simultaneously, the mutual influence is caused.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a backlight and state indicating circuit of a rocker switch of a commercial vehicle, which can be compatible with positive control switch indication and negative control switch indication, has an interlocking function between an indicating lamp and a backlight lamp, and solves the problem that the backlight lamp and the indicating lamp of the rocker switch are lightened simultaneously to influence each other.
In order to achieve the above object, the present invention provides a backlight and status indication circuit of a rocker switch for a commercial vehicle, comprising: the protection circuit is used for preventing reverse connection of the power supply; the first current limiting circuit and the second current limiting circuit are connected with the protection circuit respectively at one ends, and are connected in parallel; the display device comprises a first backlight circuit and a second backlight circuit, wherein one end of the first backlight circuit is connected with the first current limiting circuit, one end of the second backlight circuit is connected with the second current limiting circuit, the first backlight circuit and the second backlight circuit are respectively a first backlight lamp and a second backlight lamp, and the first backlight lamp and the second backlight lamp are used for providing up-down graph internal illumination of a rocker switch cover plate; the display device comprises a first indicator light circuit and a second indicator light circuit, wherein one end of the first indicator light circuit is respectively connected with a first current limiting circuit and a first backlight light circuit, the other end of the first indicator light circuit is connected with a first contact of a rocker switch, one end of the second indicator light circuit is respectively connected with a second current limiting circuit and a second backlight circuit, the other end of the second indicator light circuit is connected with a second contact of the rocker switch, and the first indicator light circuit and the second indicator light circuit are respectively a first indicator light and a second indicator light; when the negative control rocker switch is matched, one end of the protection circuit is connected with a positive power supply electrode, and the other ends of the first backlight circuit and the second backlight circuit are respectively connected with a negative power supply electrode; when the positive control rocker switch is matched, the polarities of the protection circuit, the first backlight circuit, the second backlight circuit, the first indicator light circuit and the second indicator light circuit are turned over, one end of the protection circuit is connected with the negative electrode of the power supply, and the other ends of the first backlight circuit and the second backlight circuit are respectively connected with the positive electrode of the power supply.
In a preferred embodiment, the protection circuit is a diode, the first current limiting circuit includes a first current limiting resistor, the second current limiting circuit includes a second current limiting resistor, and the first current limiting resistor and the second current limiting resistor are chip resistors.
In a preferred embodiment, the first backlight and the second backlight are both white LED backlights, the first indicator is an LED indicator having a conduction voltage less than that of the first backlight, and the second indicator is an LED indicator having a conduction voltage less than that of the second backlight.
In a preferred embodiment, the first indicator light and the second indicator light are green or red LED indicator lights.
In a preferred embodiment, when the negative-control rocker switch is matched, the anode of the diode is connected with the anode of the power supply, and the cathode of the diode is respectively connected with the first current-limiting resistor and the second current-limiting resistor.
The invention also discloses a connection method of the three-gear rocker switch adopting the backlight and state indication circuit of the commercial vehicle rocker switch, wherein the three-gear rocker switch comprises a first gear, a second gear and a third gear, and the three-gear rocker switch comprises a first wiring terminal, a second wiring terminal, a third wiring terminal, a fourth wiring terminal, a first contact and a second contact; when the three-gear rocker switch is connected in a negative control mode, a first wiring terminal is connected to the positive electrode of the storage battery, a second wiring terminal, a third wiring terminal and a fourth wiring terminal are connected to the negative electrode of the storage battery, one end of the protection circuit is correspondingly connected with the first wiring terminal, the other ends of the first indicator lamp circuit and the second indicator lamp circuit are correspondingly connected with the first contact and the second contact, and the other ends of the first backlight lamp circuit and the second backlight circuit are correspondingly connected with the fourth wiring terminal respectively; and wherein when the three-position rocker switch is in the first position, the first contact and the second contact are not connected with any lead wire, when the three-position rocker switch is in the second position, the second contact is not connected with any lead wire, the first contact is communicated with the second wiring terminal, and when the three-position rocker switch is in the third position, the first contact is not connected with any lead wire, and the second contact is communicated with the third wiring terminal.
In a preferred embodiment, when the three-position rocker switch is in the first position, the other ends of the first indicator light circuit and the second indicator light circuit are not connected with any lead, wherein the first path is: the current enters the protection circuit from one end of the protection circuit through the positive electrode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, flows into the negative electrode of the storage battery from the other end of the first backlight circuit, and is lighted; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; when the three-gear rocker switch is in the first gear, the first backlight lamp and the second backlight lamp are lighted, and the first indicator lamp and the second indicator lamp are extinguished.
In a preferred embodiment, when the three-position rocker switch is in the second position, the other end of the second indicator light circuit is not connected to any lead wire, the other end of the first indicator light circuit is connected to the first contact, the first contact is connected to the second terminal, and the first path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the cathode of the storage battery from the other end of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the first current limiting circuit, the first indicator lamp circuit, the first contact connection and the second wiring terminal, and flows into the cathode of the storage battery; at this time, the voltage at two ends of the first backlight is equal to the voltage at two ends of the first indicator lamp, and because the working voltage of the first indicator lamp is smaller than the working voltage of the first backlight, when the first indicator lamp is lighted, the two ends of the first backlight cannot be lighted because the effective voltage cannot be reached; the third path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; in the second gear, the second backlight lamp and the first indicator lamp are turned on, and the first backlight lamp and the second indicator lamp are turned off.
In a preferred embodiment, when the three-position rocker switch is in the third position, the other end of the first indicator light circuit is not connected to any lead wire, the other end of the second indicator light circuit is connected to the second contact, the second contact is connected to the third terminal, and the first path is: the current enters the protection circuit from one end of the protection circuit through the positive electrode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the negative electrode of the storage battery from the other end of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; third path: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit, the second indicator lamp circuit, the first contact and the second wiring terminal, and flows into the cathode of the storage battery; according to the principle that the parallel voltages are equal, the voltages at the two ends of the second backlight lamp are equal to the voltages at the two ends of the second indication lamp, and because the working voltage of the second indication lamp is smaller than the working voltage of the second backlight lamp, when the second indication lamp is lighted, the two ends of the second backlight lamp cannot be lighted because the effective voltage cannot be reached; in the third gear, the first backlight lamp and the second indicator lamp are turned on, and the second backlight lamp and the first indicator lamp are turned off.
Compared with the prior art, the backlight and state indicating circuit of the rocker switch of the commercial vehicle has the following beneficial effects: the invention can be compatible with the indication of a positive control switch and the indication of a negative control switch under the condition of not changing the circuit structure; the indicating lamp and the backlight lamp have an interlocking function, and the backlight lamp is automatically extinguished when the indicating lamp is lighted, so that the problem that the backlight lamp and the indicating lamp are simultaneously lighted to be mutually influenced is solved, and a light shielding sheet in the rocker switch can be omitted; the backlight and state indicating circuit has simple structure, supports the first-gear, second-gear and third-gear rocker switches, and saves the use quantity of components.
Drawings
Fig. 1 is a schematic diagram of a backlight and status indication circuit for a negative rocker switch according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a backlight and status indication circuit for a positive rocker switch according to a preferred embodiment of the present invention.
Fig. 3 is a schematic diagram of a three-level rocker switch connection according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a three-position switch according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Embodiments of the present invention are intended to be within the scope of the present invention as defined by the appended claims.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
Example 1
As shown in fig. 1 to 4, a backlight and status indication circuit of a rocker switch for a commercial vehicle according to a preferred embodiment of the present invention includes: the protection circuit, the first current limiting circuit, the second current limiting circuit, the first backlight circuit, the second backlight circuit, the first indicator light circuit and the second indicator light circuit. The protection circuit is used for preventing reverse connection of the power supply; one end of the first current limiting circuit and one end of the second current limiting circuit are respectively connected with the protection circuit, and the first current limiting circuit and the second current limiting circuit are connected in parallel. One end of the first backlight circuit is connected with the first current limiting circuit, and one end of the second backlight circuit is connected with the second current limiting circuit. The first backlight circuit and the second backlight circuit are respectively a first backlight D1 and a second backlight D2, and the first backlight D1 and the second backlight D2 are used for providing the indoor illumination of the upper graph and the lower graph of the rocker switch cover plate. One end of the first indicator light circuit is connected with the first current limiting circuit and the first backlight light circuit respectively, the other end P1 of the first indicator light circuit is connected with the first contact 1 of the rocker switch, one end of the second indicator light circuit is connected with the second current limiting circuit and the second backlight circuit respectively, the other end P2 of the second indicator light circuit is connected with the second contact 2 of the rocker switch, and the first indicator light circuit and the second indicator light circuit are a first indicator light D3 and a second indicator light D4 respectively. When the negative control rocker switch is matched, one end P8 of the protection circuit is connected with the positive electrode of the power supply, and the other ends P7 of the first backlight circuit and the second backlight circuit are respectively connected with the negative electrode of the power supply. When the positive control rocker switch is matched, the polarities of the protection circuit, the first backlight circuit, the second backlight circuit, the first indicator light circuit and the second indicator light circuit are turned over, one end P8 of the protection circuit is connected with the negative electrode of the power supply, and the other ends P7 of the first backlight circuit and the second backlight circuit are respectively connected with the positive electrode of the power supply.
In a preferred embodiment, the protection circuit is a diode D5, the first current limiting circuit includes a first current limiting resistor R1, the second current limiting circuit includes a second current limiting resistor R2, and preferably, the first current limiting resistor R1 and the second current limiting resistor R2 are chip resistors. It should be noted that, the first current limiting resistor R1 and the second current limiting resistor R2 are not limited to chip resistors, and other types of resistors may be used in practical use.
In a preferred embodiment, the first backlight D1 and the second backlight D2 are white LED backlights, the first indicator D3 is an LED indicator having a conduction voltage smaller than that of the first backlight D1, and the second indicator D4 is an LED indicator having a conduction voltage smaller than that of the second backlight D2. The first backlight D1 and the second backlight D2 may be LED backlights of other colors.
In a preferred embodiment, the first indicator light D3 and the second indicator light D4 are green, red or other colored LED indicator lights.
In a preferred embodiment, when the "negative control" rocker switch is matched, the anode of the diode D5 is connected to the positive power supply, and the cathode of the diode D5 is connected to the first current limiting resistor R1 and the second current limiting resistor R2, respectively. When the "positive control" rocker switch is matched, as shown in fig. 2, only the polarity of the first backlight D1, the second backlight D2, the first indicator D3, the second indicator D4 and the diode D5 is turned over, and the polarity is not changed.
The backlight and state indicating circuit of the rocker switch of the commercial vehicle can support the rocker switch of first gear, second gear and third gear used on the commercial vehicle.
Example 2
The invention also discloses a connection method of the three-gear rocker switch adopting the backlight and state indication circuit of the commercial vehicle rocker switch, as shown in fig. 3, the connection schematic diagram of the three-gear rocker switch is connected in a negative control mode, and the three-gear rocker switch comprises a first wiring terminal 8, a second wiring terminal 3, a third wiring terminal 4, a fourth wiring terminal 7, a first contact 1 and a second contact 2, wherein the first wiring terminal 8 is connected to the anode of a storage battery, and the second wiring terminal 3, the third wiring terminal 4 and the fourth wiring terminal 7 are all connected to the cathode of the storage battery. As shown in fig. 4, the three-position rocker switch includes a first position O, a second position I, and a third position II. When the three-gear rocker switch is in the first gear O, the first contact 1 and the second contact 2 are not connected with any lead, when the three-gear rocker switch is in the second gear I, the second contact 2 is not connected with any lead, the first contact 1 is communicated with the second wiring terminal 3, and when the three-gear rocker switch is in the third gear II, the first contact 2 is not connected with any lead, and the second contact 2 is communicated with the third wiring terminal 4.
In implementation, one end P8 of a protection circuit of a backlight and status indication circuit of a rocker switch of a commercial vehicle is correspondingly connected with a first wiring terminal 8 of a three-gear rocker switch, the other ends of a first indication lamp circuit and a second indication lamp circuit are correspondingly connected with a first contact 1 and a second contact 2, and the other ends P7 of the first backlight lamp circuit and the second backlight circuit are correspondingly connected with a fourth wiring terminal 7 respectively.
When the three-gear rocker switch is in a first gear O, the other ends P1 and P2 of the first indicator light circuit and the second indicator light circuit are not connected with any lead, wherein the first path is as follows: the current enters the protection circuit from one end P8 of the protection circuit through the positive electrode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, flows into the negative electrode of the storage battery from the other end P7 of the first backlight circuit, and the first backlight D1 circuit is lighted; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end P7 of the second backlight circuit. Therefore, when the three-position rocker switch is in the first position O, the first and second backlights D1 and D2 are turned on, and the first and second indicator lamps D3 and D4 are turned off.
When the three-gear rocker switch is in the second gear I, the other end P2 of the second indicator light circuit is not connected with any lead wire, the other end P1 of the first indicator light circuit is connected with the first contact 1, the first contact 1 is communicated with the second wiring terminal 3, and the first path is as follows: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the cathode of the storage battery from the other end P7 of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the first current limiting circuit, the first indicator lamp circuit, the first contact 1, the second wiring terminal 3 and flows into the cathode of the storage battery; at this time, the voltage at two ends of the first backlight lamp D1 is equal to the voltage at two ends of the first indicator lamp D3, and since the working voltage of the first indicator lamp D3 is smaller than the working voltage of the first backlight lamp D1, when the first indicator lamp D3 is turned on, the two ends of the first backlight lamp D1 cannot be turned on because the effective voltage cannot be reached, so that an interlocking state is reached; the third path is: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end P7 of the second backlight circuit. Therefore, in the second gear, the second backlight D2 and the first indicator D3 are turned on, and the first backlight D1 and the second indicator D4 are turned off.
In a preferred embodiment, when the three-position rocker switch is in the third position II, the other end P1 of the first indicator light circuit is not connected to any lead wire, the other end P2 of the second indicator light circuit is connected to the second contact 2, the second contact 2 is connected to the third terminal 4, and the first path is: the current enters the protection circuit from one end P8 of the protection circuit through the positive electrode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the negative electrode of the storage battery from the other end P7 of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end P7 of the second backlight circuit; third path: the current passes through the anode of the storage battery, enters the protection circuit from one end P8 of the protection circuit, sequentially passes through the second current limiting circuit, the second indicator lamp circuit, the first contact 1 and the second wiring terminal 3, and flows into the cathode of the storage battery; according to the principle that the parallel voltages are equal, the voltages at two ends of the second backlight lamp D2 are equal to the voltages at two ends of the second indicator lamp D4, and because the working voltage of the second indicator lamp D4 is smaller than the working voltage of the second backlight lamp D2, when the second indicator lamp D4 is lighted, the two ends of the second backlight lamp D2 cannot be lighted because the effective voltage cannot be reached, and the interlocking state is reached. Therefore, in the third gear, the first backlight D1 and the second indicator D4 are turned on, and the second backlight D2 and the first indicator D3 are turned off.
The description of specific exemplary embodiments of the invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (1)
1. A connection method of a three-gear rocker switch of a backlight and status indication circuit of a rocker switch of a commercial vehicle is characterized by comprising the following steps:
the three-gear rocker switch comprises a first gear, a second gear and a third gear, and the three-gear rocker switch comprises a first terminal, a second terminal, a third terminal, a fourth terminal, a first contact and a second contact; when the three-gear rocker switch is connected in a negative control mode, the first wiring end is connected to the positive electrode of the storage battery, the second wiring end, the third wiring end and the fourth wiring end are connected to the negative electrode of the storage battery, one end of the protection circuit is correspondingly connected with the first wiring end, the other ends of the first indicator lamp circuit and the second indicator lamp circuit are correspondingly connected with the first contact and the second contact, and the other ends of the first backlight lamp circuit and the second backlight circuit are respectively correspondingly connected with the fourth wiring end; and wherein the first contact and the second contact are not connected to any lead when the three-position rocker switch is in the first position, the second contact is not connected to any lead when the three-position rocker switch is in the second position, the first contact is connected to the second terminal, the first contact is not connected to any lead when the three-position rocker switch is in the third position, the second contact is connected to the third terminal,
when the three-gear rocker switch is in a first gear, the other ends of the first indicator light circuit and the second indicator light circuit are not connected with any lead, wherein the first path is as follows: the current enters the protection circuit from one end of the protection circuit through the positive electrode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, flows into the negative electrode of the storage battery from the other end of the first backlight circuit, and is lightened; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; when the three-shift rocker switch is in the first shift position, the first backlight lamp and the second backlight lamp are lighted, the first indicator lamp and the second indicator lamp are extinguished,
when the three-gear rocker switch is in a second gear, the other end of the second indicator light circuit is not connected with any lead wire, the other end of the first indicator light circuit is connected with a first contact, the first contact is communicated with a second wiring terminal, and the first path is as follows: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the cathode of the storage battery from the other end of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the first current limiting circuit, the first indicator lamp circuit, the first contact and the second wiring terminal, and flows into the cathode of the storage battery; at this time, the voltage at two ends of the first backlight is equal to the voltage at two ends of the first indicator lamp, and because the working voltage of the first indicator lamp is smaller than the working voltage of the first backlight, when the first indicator lamp is lighted, the two ends of the first backlight cannot be lighted because the effective voltage cannot be reached; the third path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; in the second gear, the second backlight lamp and the first indicator lamp are lighted, the first backlight lamp and the second indicator lamp are extinguished,
when the third-gear rocker switch is in a third gear, the other end of the first indicator light circuit is not connected with any lead wire, the other end of the second indicator light circuit is connected with a second contact, the second contact is communicated with a third wiring terminal, and the first path is as follows: the current enters the protection circuit from one end of the protection circuit through the anode of the storage battery, sequentially passes through the first current limiting circuit and the first backlight circuit, and flows into the cathode of the storage battery from the other end of the first backlight circuit; the second path is: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit and the second backlight circuit, and flows into the cathode of the storage battery from the other end of the second backlight circuit; third path: the current passes through the anode of the storage battery, enters the protection circuit from one end of the protection circuit, sequentially passes through the second current limiting circuit, the second indicator lamp circuit, the second contact and the third wiring terminal, and flows into the cathode of the storage battery; according to the principle that the parallel voltages are equal, the voltages at the two ends of the second backlight lamp are equal to the voltages at the two ends of the second indication lamp, and because the working voltage of the second indication lamp is smaller than the working voltage of the second backlight lamp, when the second indication lamp is lighted, the two ends of the second backlight lamp cannot be lighted because the effective voltage cannot be reached; in the third gear, the first backlight lamp and the second indicator lamp are turned on, and the second backlight lamp and the first indicator lamp are turned off.
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|---|---|---|---|---|
| CN104080236A (en) * | 2013-03-28 | 2014-10-01 | 林万炯 | LED lamp control system |
| CN109922558A (en) * | 2017-12-13 | 2019-06-21 | 华润矽威科技（上海）有限公司 | A kind of linear constant current module adjusts the circuit and method of colour temperature |
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| CN112038152A (en) | 2020-12-04 |
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